What was found
ON APPROACH WITH A SLING LOAD THE BATTERY DOOR OPEN AT A SPEED OF 60 MPH AND THE DOOR HINGE BROKE. THE DOOR STAYED ATTACH TO THE AIRCRAFT BY THE SPRING P/N 206-031-155-005. NO OTHER DAMAGES HAVE BEEN FOUND ON THE AIRCRAFT. AFTER INVESTIGATION, THE HINGE P/N 206-033-111-023 HAVE BEEN FOUND THAT IT WAS PARTIALLY BROKEN BEFORE THE INCIDENT. ALSO, THE D2U5 FASTENER USED TO KEEP THE DOOR IN CLOSE POSITION WHERE A DASH TOO LONG WITH THE RESULT THAT YOU COULD CLOSE THEM TO FAR OUT OF THE LOCK POSITION IN A WAY THAT IT NEEDED JUST A WEAK FORCE TO MOVE THEM IN THE OPEN POSITION. AFTER HINGE REPLACEMENT THE USE OF PROPER D2U5 LENGTH ALONG WITH RED LINE FOR LOCK POSITION FOR PREVENTION.